# Checksum
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Constants](https://developer.android.com/reference/android/content/pm/Checksum#constants)\|[Inherited Constants](https://developer.android.com/reference/android/content/pm/Checksum#inhconstants)\|[Fields](https://developer.android.com/reference/android/content/pm/Checksum#lfields)\|[Ctors](https://developer.android.com/reference/android/content/pm/Checksum#pubctors)\|[Methods](https://developer.android.com/reference/android/content/pm/Checksum#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/android/content/pm/Checksum#inhmethods)
# Checksum
*** ** * ** ***
[Kotlin](https://developer.android.com/reference/kotlin/android/content/pm/Checksum "View this page in Kotlin")\|Java
`
public
final
class
Checksum
`
`
extends `[Object](https://developer.android.com/reference/java/lang/Object)`
``
implements
`[Parcelable](https://developer.android.com/reference/android/os/Parcelable)`
`
|---|-----------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) ||
| ↳ | android.content.pm.Checksum |
*** ** * ** ***
A typed checksum.
**See also:**
- [ApkChecksum](https://developer.android.com/reference/android/content/pm/ApkChecksum)
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
## Summary
| ### Constants ||
|-------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | [TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256) Root SHA256 hash of a 1M Merkle tree computed over protected content. |
| `int` | [TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512) Root SHA512 hash of a 1M Merkle tree computed over protected content. |
| `int` | [TYPE_WHOLE_MD5](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MD5) *This constant was deprecated in API level 31. Not platform enforced. Cryptographically broken and unsuitable for further use. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.* |
| `int` | [TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256) Root SHA256 hash of a 4K Merkle tree computed over all file bytes. |
| `int` | [TYPE_WHOLE_SHA1](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA1) *This constant was deprecated in API level 31. Not platform enforced. Broken and should not be used. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.* |
| `int` | [TYPE_WHOLE_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA256) *This constant was deprecated in API level 31. Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.* |
| `int` | [TYPE_WHOLE_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA512) *This constant was deprecated in API level 31. Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.* |
| ### Inherited constants |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From interface[android.os.Parcelable](https://developer.android.com/reference/android/os/Parcelable) |-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | [CONTENTS_FILE_DESCRIPTOR](https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR) Descriptor bit used with[describeContents()](https://developer.android.com/reference/android/os/Parcelable#describeContents()): indicates that the Parcelable object's flattened representation includes a file descriptor. | | `int` | [PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE) Flag for use with[writeToParcel(Parcel, int)](https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)): the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`". | |
| ### Fields ||
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------|
| ` public static final `[Creator](https://developer.android.com/reference/android/os/Parcelable.Creator)`<`[Checksum](https://developer.android.com/reference/android/content/pm/Checksum)`>` | [CREATOR](https://developer.android.com/reference/android/content/pm/Checksum#CREATOR)
|
| ### Public constructors ||
|---------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[Checksum](https://developer.android.com/reference/android/content/pm/Checksum#Checksum(int,%20byte[]))`(int type, byte[] value) ` Creates a new Checksum. |
| ### Public methods ||
|-----------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` int` | ` `[describeContents](https://developer.android.com/reference/android/content/pm/Checksum#describeContents())`() ` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. |
| ` int` | ` `[getType](https://developer.android.com/reference/android/content/pm/Checksum#getType())`() ` Checksum type. |
| ` byte[]` | ` `[getValue](https://developer.android.com/reference/android/content/pm/Checksum#getValue())`() ` Checksum value. |
| ` void` | ` `[writeToParcel](https://developer.android.com/reference/android/content/pm/Checksum#writeToParcel(android.os.Parcel,%20int))`(`[Parcel](https://developer.android.com/reference/android/os/Parcel)` dest, int flags) ` Flatten this object in to a Parcel. |
| ### Inherited methods |
|-----------------------|---|
| From class` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` `[finalize](https://developer.android.com/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](https://developer.android.com/reference/java/lang/Class)`` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this`Object`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long,%20int))`(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long))`(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*. | ||
| From interface` `[android.os.Parcelable](https://developer.android.com/reference/android/os/Parcelable)` ` |------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` abstract int` | ` `[describeContents](https://developer.android.com/reference/android/os/Parcelable#describeContents())`() ` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. | | ` abstract void` | ` `[writeToParcel](https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int))`(`[Parcel](https://developer.android.com/reference/android/os/Parcel)` dest, int flags) ` Flatten this object in to a Parcel. | ||
## Constants
### TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256
```
Root SHA256 hash of a 1M Merkle tree computed over protected content. Excludes signing block.[See APK Signature Scheme V2](https://source.android.com/security/apksigning/v2).
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 32 (0x00000020)
### TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512
```
Root SHA512 hash of a 1M Merkle tree computed over protected content. Excludes signing block.[See APK Signature Scheme V2](https://source.android.com/security/apksigning/v2).
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 64 (0x00000040)
### TYPE_WHOLE_MD5
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_WHOLE_MD5
```
**This constant was deprecated in API level 31.**
Not platform enforced. Cryptographically broken and unsuitable for further use. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.
MD5 hash computed over all file bytes.
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 2 (0x00000002)
### TYPE_WHOLE_MERKLE_ROOT_4K_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_WHOLE_MERKLE_ROOT_4K_SHA256
```
Root SHA256 hash of a 4K Merkle tree computed over all file bytes.[See APK Signature Scheme V4](https://source.android.com/security/apksigning/v4).[See fs-verity](https://www.kernel.org/doc/html/latest/filesystems/fsverity.html). Recommended for all new applications. Can be used by kernel to enforce authenticity and integrity of the APK.[See fs-verity for details](https://www.kernel.org/doc/html/latest/filesystems/fsverity.html)
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 1 (0x00000001)
### TYPE_WHOLE_SHA1
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_WHOLE_SHA1
```
**This constant was deprecated in API level 31.**
Not platform enforced. Broken and should not be used. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.
SHA1 hash computed over all file bytes.
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 4 (0x00000004)
### TYPE_WHOLE_SHA256
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_WHOLE_SHA256
```
**This constant was deprecated in API level 31.**
Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.
SHA256 hash computed over all file bytes.
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 8 (0x00000008)
### TYPE_WHOLE_SHA512
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Deprecated in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final int TYPE_WHOLE_SHA512
```
**This constant was deprecated in API level 31.**
Not platform enforced. Use platform enforced digests e.g.[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256). Provided for completeness' sake and to support legacy usecases.
SHA512 hash computed over all file bytes.
**See also:**
- [PackageManager.requestChecksums(String, boolean, int, List, OnChecksumsReadyListener)](https://developer.android.com/reference/android/content/pm/PackageManager#requestChecksums(java.lang.String,%20boolean,%20int,%20java.util.List,%20android.content.pm.PackageManager.OnChecksumsReadyListener))
Constant Value: 16 (0x00000010)
## Fields
### CREATOR
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public static final Creator CREATOR
```
## Public constructors
### Checksum
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public Checksum (int type,
byte[] value)
```
Creates a new Checksum.
| Parameters ||
|---------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `type` | `int`: Checksum type. Value is[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256),[TYPE_WHOLE_MD5](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MD5),[TYPE_WHOLE_SHA1](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA1),[TYPE_WHOLE_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA256),[TYPE_WHOLE_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA512),[TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256), or[TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512)
|
| `value` | `byte`: Checksum value. This value cannot be`null`.
|
## Public methods
### describeContents
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int describeContents ()
```
Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of[writeToParcel(android.os.Parcel, int)](https://developer.android.com/reference/android/os/Parcelable#writeToParcel(android.os.Parcel,%20int)), the return value of this method must include the[CONTENTS_FILE_DESCRIPTOR](https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR)bit.
| Returns ||
|-------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either`0`or[CONTENTS_FILE_DESCRIPTOR](https://developer.android.com/reference/android/os/Parcelable#CONTENTS_FILE_DESCRIPTOR)
|
### getType
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public int getType ()
```
Checksum type.
| Returns ||
|-------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `int` | Value is[TYPE_WHOLE_MERKLE_ROOT_4K_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MERKLE_ROOT_4K_SHA256),[TYPE_WHOLE_MD5](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_MD5),[TYPE_WHOLE_SHA1](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA1),[TYPE_WHOLE_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA256),[TYPE_WHOLE_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_WHOLE_SHA512),[TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA256), or[TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512](https://developer.android.com/reference/android/content/pm/Checksum#TYPE_PARTIAL_MERKLE_ROOT_1M_SHA512)
|
### getValue
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public byte[] getValue ()
```
Checksum value.
| Returns ||
|----------|------------------------------------|
| `byte[]` | This value cannot be`null`.
|
### writeToParcel
Added in[API level 31](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public void writeToParcel (Parcel dest,
int flags)
```
Flatten this object in to a Parcel.
| Parameters ||
|---------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `dest` | `Parcel`: This value cannot be`null`.
|
| `flags` | `int`: Additional flags about how the object should be written. May be 0 or[Parcelable.PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE). Value is either`0`or a combination of[Parcelable.PARCELABLE_WRITE_RETURN_VALUE](https://developer.android.com/reference/android/os/Parcelable#PARCELABLE_WRITE_RETURN_VALUE), and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES
|